The new package (pictured above) employs a 16-cylinder natural-gas-fired reciprocating engine, the G16NB, and boasts an electrical efficiency of 44.3%, which MHIET says is the highest in the world for a 2 MW class machine, with the high efficiency enabling the CHP package to be more compact.
The electrical efficiency of the SGP M2000 is 1.8 percentage points higher than MHIET’s existing, 1000 kW, recip-based cogeneration offering.
As a result of an “extensive effort” the SGP M2000 is able to give twice as much output as this existing cogeneration system with an engine of the same displacement, reducing the footprint by 40%. The compactness “allows the SGP M2000 to be installed in limited spaces such as buildings in urban areas”, says MHIET.
To date, the SGP M2000 has accumulated over 50 000 operating hours on a number of units in various locations, including one at MHIET’s private power plant in its Sagamihara premises.
The G16NB was originally developed as part of a project supported by NEDO (New Energy and Industrial Technology Development Organization). Contributors to the high efficiency include use of steel pistons for increased max cylinder pressure, improved fuel combustion thanks to Miller cycle/two-stage turbocharging, and optimised control of ignition timing for each cylinder.
